Improvement in molds for plaster pipe-patterns



N. P.- BUWLER.

\ Molds for Plaster Pipe Patterns.

I No. 142,765, Patented Septamber16 ,1873.

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NITED STATES PATENT QFFICE.

I NOADIAH I. BO'WLER, OF CLEVELAND, OHIO.

IMPROVEMENT IN MQLDS FOR PLASTER PIPE-PATTERNS.

Specification forming part of Letters Patent No. 142,765, datedSeptember 16, 1873; application filed March 28, 1873.

To all whom it may concern:

Be it known that I, N OADIAH P. BOWLER,

of Cleveland, in the county of Uuyahoga and State of Ohio, have inventedcertain new and useful Improvements in Molds for Making Hawser-Pipes andother Pipe-Patterns, of which the following is a description, referencebeing had to the accompanying drawings making part of thisspecification, in which Figure 1 is a side View of the mold. Fig. 2 is avertical transverse section. Fig. 3 is a top view.

Like letters of reference refer to like parts in the several views.

The nature of this invention relates to a mold in which to cast patternsfor hawserpipes and other pipes; the object thereof being to make saidpatterns of plaster instead of wood, thereby reducing the cost of saidpatterns, and which are more easily and readily changed or modified inorder to adapt them to peculiar purposes, in consequence of the softnature of the material of which they are made, than are the ordinarywooden pipe-patterns.

0f the construction of the aforesaid molds the following is a detaileddescription: In the drawing, A represents a sheet-iron cylinder, thelength of which is about that of the pipe required, and in diameterequal to the outside thereof. The ends of the sheet of which thecylinder is made lap over each other, and are thus secured by means ofsetscrews B. Slots a are cut in one end of the sheet in which the screwsslide, the purpose of which is to give to the cylinder more or lesstaper, so that the mold or pattern cast therein can be drawn from thesand. Inside of said cylinder A, concentrically therewith, is arranged acylinder, 0, of the same material, and of the same length, but of lessdiameter, it being about that of the base of the pipe required. The endsof the sheet of which this cylinder is made also lap onto each other,which, in like manner, are secured by setscrews D and slots to for asimilar purpose as inders are, in like manner, held in grooves made inthe cross F, Fig. 3. By this means the two cylinders are heldconcentrically, one within the other, as shown in the drawing, in whichit will be seen that between the two cylinders there is an annular spaceor chamber, G, which space is about equal to the thickness required forthe pipe.

The practical use of said mold is as follows: The annular space Greferred to is filled with semi-liquid plaster, which, when hardened, isremoved therefrom The cast thus made will be a plaster pipe of the shapeand size required for a pattern of apipe.

This mode of making pipepatterns is desirable for making patterns forhawser-pipes, as, in consequence of the soft nature of the material, theends of the pipe can be easily cut to certain angles suitable to fit thebows of any one particular vessel and the same pattern can be quicklyand easily modified to fit the bows of others.

Pipes of different diameters are made by Witnesses: 1

J. H. BURRIDGE, A. F. CORNELL.

